1. The skin performs all of the following except
Production of chemical messengers
Elimination of waste products
Control of body temperature
protection

2. Students will know… Explain what an action potential is?
K+ ions are entering the neuron
Negatively charged proteins are leaving the neuron
Na+ ions are entering the neuron
The myelin coat has broken down and ions are crossing freely

3. Students will know…
Which is the correct path a nerve impulse will follow in a reflex arc?
Put these three terms in order
Motor neuron, sensory neuron and interneuron

4. Nervous System
Chapter 33.1

5. Structure of the Nervous System
Neurons conduct electrical impulses
allow cells, tissues, and organs
detect and respond to stimuli

6. Neurons
Specialized cells
Help you gather information

7. Neuron

8. Neuron
Dendrites – receive signals and send them to the cell body

9. Neuron Dendrites – receive signals and send them to the cell body
Cell body – nucleus of the neuron and other organelles

10. Neuron Dendrites – receive signals and send them to the cell body
Cell body – nucleus of the neuron and other organelles
Axon – caries the nerve impulse from cell body to other neurons and muscles

11. Reflex Arc Nerve pathway Basic structure of the nervous system
Sensory neuron to an interneuron, and a motor neuron

12. An Action Potential Nerve impulse A stimulus reaches threshold
Channels in the plasma membrane open
Potassium ions leave the cell
Change in charge moves

13. Action Potential

14. Dendrites and synapses
Which of the following pairs lists the fiber-like extensions that are components of neurons?
Axons and myelin
Synapses and myelin
Dendrites and synapses
Dendrites and axons

15. Organization of Nervous System
Chapter 33.2

16. Organization of the Nervous System
Central nervous system
Peripheral nervous system

17. The Central Nervous System
CNS
Spinal Cord
Brain
Relays messages
Processes information
Analyzes responses

18. The Brain Made up of 100 billion neurons Maintains homeostasis
Control center

19. The Brain Made up of 100 billion neurons Maintains homeostasis
Control center
Homeostasis – maintains a constant condition

20. The Brain

21. The Brain

22. Cerebrum Largest part Divided into two hemispheres
Thought process of memory, language, speech, voluntary body movements and sensory perception

23. Cerebellum
Controls balance, posture and coordination
Back of brain

24. Brain Stem Connects the brain to the spinal cord Made up of
Medulla oblongata (signals between brain and spinal cord)
Pons (signals between cerebrum and cerebellum)

25. Spinal Cord Nerve column from your brain to the lower back
Protected by vertebrae

26. Spinal Cord

27. The Peripheral Nervous System
Somatic Nervous System
Autonomic Nervous System

28. Somatic Nervous System
Relays information to and from skin and skeletal muscles
Voluntary

29. Autonomic Nervous System
Relays information to internal organs
Involuntary

30. Autonomic Nervous System
Sympathetic
Parasympathetic
Pupil dilation
Heart rate increased
Bronchial muscle relaxed
Small intestine muscle contractions reduced
Pupil constriction
Heart rate decrease
Bronchial muscles contracted
Digestion increased

31. Unit 9
Chapter 33.3

32. Quiz 1. Draw and label a neuron Describe a Reflex Arc Pathway
Describe an Action Potential

33. The Senses
Chapter 33.3

34. The Senses
Sensory receptors allow you to detect the world around you

35. Taste and Smell
Stimulated by chemicals
Work together

36. Smell Sensory receptors high in the nose Respond to chemicals
Signal the brain

37. Taste
Taste buds
Detect sweet, sour, salty and bitter

38. Nature
August 2006
Wrong!

39. Sight Light enters the eye Through the cornea
Behind the iris is the lens
To the retina (rods and cones)
Signals sent to brain
Brain interprets

40. Sight

41. Hearing and Balance
Function of the ear
Volume
Highness and lowness

42. To Hear Sound waves Ear canal Eardrum to vibrate
Through the malleus, incus, stapes
Inner ear cochlea
Sends signals to the brain

43. Ear

44. To Balance Cochlea Semicircular Canals At 900
Fluid filled, lined hairs
Head moves the fluid moves and sends signals to brain

45. Ear

46. Touch Sensory receptors Respond to temperature pressure and pain
Epidermis and dermis
Tips of fingers have lots
Not everywhere